diff --git a/avr/modules/uart_hw/comonuart0.asm b/avr/modules/uart_hw/comonuart0.asm
index 5133005..96c43a8 100644
--- a/avr/modules/uart_hw/comonuart0.asm
+++ b/avr/modules/uart_hw/comonuart0.asm
@@ -536,6 +536,8 @@ comOnUart0Init:
     lds r16, COM_ATTN_PUE
     cbr r16, COM_ATTN_PIN           ; disable pullup on ATTN
     sts COM_ATTN_PUE, r16
+.else
+  cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable pullup on ATTN
 .endif
   rcall comOnUart0SetAttnInput
   M_UART_HW_Uart_Init 0
@@ -681,11 +683,9 @@ comOnUart0TxCharIsr:
 ; @clobbers none
 
 comOnUart0SetAttnInput:
-  cbi COM_ATTN_DDR, COM_ATTN_PIN           ; set ATTN as input
-.ifdef COM_ATTN_PUE
-  cbi COM_ATTN_PUE, COM_ATTN_PIN           ; disable pullup on ATTN
-.else
-  cbi COM_ATTN_OUTPUT, COM_ATTN_PIN        ; disable pullup on ATTN
+  cbi COM_ATTN_DDR, COM_ATTN_PIN          ; set ATTN as input
+.ifndef COM_ATTN_PUE
+  cbi COM_ATTN_OUTPUT, COM_ATTN_PIN       ; disable pullup on ATTN
 .endif
 
 .if COM_IRQ_BIT_ATTN == INT0